I think if we talk about the best altcoin by 2018 this of course it is ethereum,
because ethereum has a bright and promising future,
so I think so ethereum does not need to be doubted anymore
yes, that is a fact I see the development of Ethereum is better than other ALtcoin and now it is widely used by ICO project, the average of all projects using Ethereum so I believe the future of ETH is very bright.
I concluded that Ethereum being the best Altcoin in 2018 became the main coin that was very capable of being relied upon. with the present developments so capable of making Ethereum become a precious coin in the future and becoming an expensive coin going forward.